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For those who don't know, the Tendo is a device which you can use to measure the peak/avg. velocity of your lifts. I've always wanted one, but at $1600 (http://store.sorinex.com/Tendo-Weightlifting-Analyzer-p/t-2.htm) it was way out of my price range.
Empirical Correlations between Peak Ground Velocity and Spectrum-Based Intensity Measures. Empirical correlation equations between peak ground velocity (PGV) and several spectrum-based ground motion intensity measures are developed. The intensity measures examined in particular were: peak ground acceleration (PGA), 5% damped pseudo-spectral acceleration (SA), acceleration spectrum intensity (ASI), and spectrum intensity (SI).